number_format

(PHP 4, PHP 5, PHP 7, PHP 8)

number_format — 以千位分隔符方式格式化一个数字

说明

number_format(
    float $num,
    int $decimals = 0,
    ?string $decimal_separator = ".",
    ?string $thousands_separator = ","
): string

使用四舍五入的规则，将数字格式化为千位分组和小数位（可选）。

参数

num: 要格式化的数字。
decimals: 设置小数位数。如果为 0，则从返回值中忽略 decimal_separator。自 PHP 8.3.0 起，当值为负数时，num 将四舍五入为小数点前的有效数字 decimals。在 PHP 8.3.0 之前，负值将被忽略并与 0 一样处理。
decimal_separator: 指定小数点的分隔符。
thousands_separator: 设置千位分隔符。

返回值

num 的格式化版本。

更新日志

版本	说明
8.3.0	新增对 `decimals` 负值的处理。
8.0.0	在此版本之前，number_format() 接受一个、两个或四个参数（不会是三个）。
7.2.0	number_format() 现在再也不会返回 `-0`，之前 `num` 为 `-0.01` 的情况下可以返回 `-0`。

示例

示例 #1 number_format() 示例

例如，法语计数通常使用两位小数，逗号（“,”）作为小数分隔符，空格（“ ”）作为千位分隔符。以下示例展示了格式化数字的各种方法：

<?php

$number = 1234.56;

// 英文计数（默认）
$english_format_number = number_format($number);
// 1,235

// 法语计数
$nombre_format_francais = number_format($number, 2, ',', ' ');
// 1 234,56

$number = 1234.5678;

// 没有千位分隔符的英文计数
$english_format_number = number_format($number, 2, '.', '');
// 1234.57

?>

示例 #2 decimals 为负值

自 PHP 8.3.0 起，使用 decimals 的负值来对小数点前的有效数字的位数进行四舍五入。

<?php
$number = "1234.5678";
var_dump(number_format($number, -1));
var_dump(number_format($number, -2));
var_dump(number_format($number, -3));
?>

以上示例会输出：

string(5) "1,230"
string(5) "1,200"
string(5) "1,000"

参见

money_format() - 将数字格式化成货币字符串
sprintf() - 返回格式化字符串
printf() - 输出格式化字符串
sscanf() - 根据指定格式解析输入的字符

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用户贡献的备注 7 notes

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423

thomas at weblizards dot de ¶

16 years ago

It's not explicitly documented; number_format also rounds:

<?php
$numbers = array(0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009);
foreach ($numbers as $number)
    print $number."->".number_format($number, 2, '.', ',')."<br>";
?>

0.001->0.00
0.002->0.00
0.003->0.00
0.004->0.00
0.005->0.01
0.006->0.01
0.007->0.01
0.008->0.01
0.009->0.01

down

info at ensostudio dot ru ¶

3 years ago

Note: use NumberFormatter to convert in human-readable format instead  user function from comments:
<?php
echo NumberFormatter::create('en', NumberFormatter::SPELLOUT)->format(12309); // twelve thousand three hundred nine
echo NumberFormatter::create('ru', NumberFormatter::SPELLOUT)->format(12307.5); //  двенадцать тысяч триста семь целых пять десятых
?>

down

james at bandit dot co.nz ¶

15 years ago

Outputs a human readable number.

<?php
#    Output easy-to-read numbers
    #    by james at bandit.co.nz
function bd_nice_number($n) {
// first strip any formatting;
$n = (0+str_replace(",","",$n));

// is this a number?
if(!is_numeric($n)) return false;

// now filter it;
if($n>1000000000000) return round(($n/1000000000000),1).' trillion';
        else if($n>1000000000) return round(($n/1000000000),1).' billion';
        else if($n>1000000) return round(($n/1000000),1).' million';
        else if($n>1000) return round(($n/1000),1).' thousand';

        return number_format($n);
    }
?>

Outputs:

247,704,360 -> 247.7 million
866,965,260,000 -> 867 billion

down

Jeroen de Bruijn [NL] ¶

19 years ago

If you want to display a number ending with ,- (like 200,-) when there are no decimal characters and display the decimals when there are decimal characters i use:

function DisplayDouble($value)
  {
  list($whole, $decimals) = split ('[.,]', $value, 2);
  if (intval($decimals) > 0)
    return number_format($value,2,".",",");
  else
    return number_format($value,0,".",",") .",-";
  }

down

Theo Diem ¶

21 years ago

formatting numbers may be more easy if u use number_format function.

I also wrote this :
function something($number)
{
    $locale = localeconv();
    return number_format($number,
       $locale['frac_digits'],
        $locale['decimal_point'],
        $locale['thousands_sep']);
}

hope this helps =)
[]'s

down

MarcM ¶

19 years ago

For Zero fill - just use the sprintf() function

$pr_id = 1;
$pr_id = sprintf("%03d", $pr_id);
echo $pr_id;

//outputs 001
-----------------

$pr_id = 10;
$pr_id = sprintf("%03d", $pr_id);
echo $pr_id;

//outputs 010
-----------------

You can change %03d to %04d, etc.

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stm555 at hotmail dot com ¶

19 years ago

I ran across an issue where I wanted to keep the entered precision of a real value, without arbitrarily rounding off what the user had submitted.

I figured it out with a quick explode on the number before formatting. I could then format either side of the decimal.

<?php
function number_format_unlimited_precision($number,$decimal = '.')
      {
$broken_number = explode($decimal,$number);
           return number_format($broken_number[0]).$decimal.$broken_number[1];
      }
?>

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